Anyone who thinks that the abuse of mosques to hide terrorists is new should read Murder at the Harlem Mosque, an account of how Black Muslims in the early 1970s used a mosque to shield the murder of a New York City cop. It’s a terrible thing when the government starts zeroing in on houses of worship; we are all less free for the precedent. But separation of church and crime is at least as important as separation of church and state. People of faith do themselves and their devotions no favors by granting sanctuary to those who spread violence, nor by inciting the hatred that feuls such violence. The best way, after all, to stop people from killing in the name of God is for leaders of the faith to make clear that He will grant no favor to those who do so.